Blind people fold their cash in different ways to distinguish the bills. In case of paying with bitcoin, there will be accessibility features for them. They would be using voice over and voice command. I am sure someone will build something and make it popular among the blind people. Have you heard of braille terminal? Maybe they will come up with a hardware wallet with a braille terminal?
In fact, for blind people, no one pays too much attention to their lives.
What makes you say that?